Reference sheet for the Latch R2 access-control reader. Use this article to look up dimensions, certifications, supported credentials, electrical specs, and reader behavior when installing, servicing, or specifying the device.
Model and applicability
Field
Value
Product line
Latch R Series
Generation
Generation 2 (R2)
Model
R2
FCC ID
2AK5B-R2
IC ID
22134-R2
Certified firmware
R2.2.1 (for UL294 compliance) — newer firmware may apply for active deployments
Features
Feature
Specification
Credential types
Smartphone (DOOR app), NFC Keycard, Doorcode
Users per device
5,000
Camera
135° image capture
Integration modes
Standalone, or as a reader with an access control panel
Management
DOOR app (resident, property-manager, and installer) and DOOR OS (cloud)
Communication
Feature
Specification
Wireless standards
Bluetooth Low Energy 4.2 (BLE), Near Field Communication (NFC), WiFi 802.11 b/g/n (2.4 GHz)
Lock relay reverts to open state — fail-safe by default
Battery / Qi backup
None
For UL 294 installations, the power source must comply with one of: UL 294, UL 603, UL 864, or UL 1481. For ULC 60839-11-1 installations, the power source must comply with ULC S304 or ULC S318.
Inputs, outputs, and relay
Feature
Specification
Lock relay
1 × configurable SPST, normally open; 1.5 A max at 24 VDC or 16 VAC max
IO ports
3 × configurable input/output (input: normally low; output: open drain)
IO rating
0.35 A max sink, 24 VDC max per port
RS-485 (A/D0, B/D1)
5 VDC reference, COM_GND return
Wiegand (A/D0, B/D1)
26-bit, output only — 5 VDC, 25 mA source each
Termination
10-conductor cable with pre-tinned leads, plus RJ45 Ethernet plug
Reference grounding
Voltage difference between GND and COM_GND must not exceed 25 V
Wiring distance recommendations
Minimum wire gauge for power runs:
Distance
12 V
24 V
< 50 ft
22 AWG
22 AWG
< 200 ft
20 AWG
20 AWG
< 500 ft
18 AWG
20 AWG
< 1000 ft
14 AWG
20 AWG
Wiegand (shielded cable):
Distance
Gauge
< 50 ft
22 AWG
< 200 ft
22 AWG
< 500 ft
20 AWG
< 1000 ft
20 AWG
Relay wiring: 22 AWG up to 50 ft, 20 AWG up to 200 ft, 18 AWG up to 500 ft.
Environmental
Feature
Specification
Operating temperature (device)
-40°C to 66°C (-40°F to 151°F)
Operating temperature (camera)
-30°C to 66°C (-22°F to 151°F)
Storage temperature
-40°C to 66°C
Operating humidity
93% at 32°C, non-condensing
Environmental rating
IP65 (dust- and water-jet resistant), IK04 (impact resistant)
Mechanical
Feature
Specification
Dimensions
5.49" × 3.18" × 0.76" (139.5 × 80.8 × 19.3 mm)
Mounting options
Surface mount, compatible with single-gang electrical boxes, or FABboxx brackets for hard surfaces and mullion mounting
Mounting hardware
#6 flathead screws — pan-head screws are not compatible and will cause the device to disengage
Security
Single security screw at the bottom of the device locks it to the mounting plate
Finishes
Latch Black
Configuration platform requirements
Installation, activation, and on-device configuration: the DOOR app on iOS or Android. The Latch Manager app referenced in the 2020 install PDF has been replaced by the DOOR app.
Day-to-day resident unlocks: DOOR app on iOS, watchOS, or Android.
Property-manager configuration of DSN, EFA, and Relock: DOOR app → Devices → select the door → Settings. The phone must be within Bluetooth range of the R2 for configuration changes to apply (updates push to the device over BLE).
Reader behavior (indicator LEDs and buzzer)
The R2 has a touch-activated keypad with backlit keys and a set of indicator LEDs around the upper portion of the device. Behavior is documented in the R Series Installation Guide:
Condition
Indication
Normal standby
All indicator LEDs off, keypad not illuminated
Keypad active
Keypad LEDs illuminated when a finger is detected on the touch surface
Authenticating user
Top indicator LED illuminated
Access granted
Audible buzzer, all indicator LEDs illuminate and power down in a clockwise animation
Access denied
Keypad LEDs blink multiple times
The R2 is wired-powered. A device with all LEDs off and no response to keypad touch is unpowered, not asleep. There is no battery state to check.